Photos framework image from video at a certain frame

Question

I have made a library collectionview filled with videos i fetch from the Photos framework, i use thumbnails to display all the different videos using the following method

func requestImageForAsset(_ asset: PHAsset!, targetSize targetSize: CGSize, contentMode contentMode: PHImageContentMode, options options: PHImageRequestOptions!, resultHandler resultHandler: ((UIImage!, [NSObject : AnyObject]!) -> Void)!) -> PHImageRequestID

which works fine. But my videos always start with a black frame, so all the thumbnails are black. can I offset the frame from which it takes a snapshot image?

Answer 1

This is code i have used in my project which works like a charm for me

func generateThumnail(url: URL) -> UIImage? {
    let asset = AVAsset(url: url)
    let assetImgGenerate = AVAssetImageGenerator(asset: asset)
    assetImgGenerate.appliesPreferredTrackTransform = true
    assetImgGenerate.maximumSize = CGSize(width: 100, height: 100)
    let time = CMTimeMake(1, 30)

    if let img = try? assetImgGenerate.copyCGImage(at: time, actualTime: nil) {
        return UIImage(cgImage: img)
    }
    return nil
}

The above function will return the image at 1 sec of the video

This is the way of passing the assetUrl of your video to get the thumbnail

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {

    let mediaType = info[UIImagePickerControllerMediaType] as! String
    if (mediaType == kUTTypeMovie as! String){
        let tempVideo = info[UIImagePickerControllerMediaURL] as! URL
        if let thumbnail = self.generateThumbnail(url: tempVideo) {
            // Use your thumbnail
        }